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fast key-value storage library

LevelDB is a fast key-value storage library written at Google that
provides an ordered mapping from string keys to string values.

Features:

* Keys and values are arbitrary byte arrays.
* Data is stored sorted by key.
* Callers can provide a custom comparison function to override
the sort order.
* The basic operations are Put(key,value), Get(key), Delete(key).
* Multiple changes can be made in one atomic batch.
* Users can create a transient snapshot to get a consistent view of
data.
* Forward and backward iteration is supported over the data.
* Data is automatically compressed using the Snappy compression
library.
* External activity (file system operations etc.) is relayed through
a virtual interface so users can customize the operating system
interactions.
* Detailed documentation about how to use the library is included with
the source code.

Limitations:

* This is not a SQL database. It does not have a relational data model,
it does not support SQL queries, and it has no support for indexes.
* Only a single process (possibly multi-threaded) can access a
particular database at a time.
* There is no client-server support builtin to the library.
An application that needs such support will have to wrap their own
server around the library.